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Title: A new parameter in attractor single-field inflation
Authors: Gong, Jinn Ouk
Sasaki, Misao  kyouindb  KAKEN_id
Author's alias: 佐々木, 節
Issue Date: 30-Jul-2015
Publisher: Elsevier
Journal title: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume: 747
Start page: 390
End page: 394
Abstract: We revisit the notion of slow-roll in the context of general single-field inflation. As a generalization of slow-roll dynamics, we consider an inflaton ϕ in an attractor phase where the time derivative of ϕ is determined by a function of ϕ, ϕ˙=ϕ˙(ϕ). In other words, we consider the case when the number of e-folds N counted backward in time from the end of inflation is solely a function of ϕ, N=. N(ϕ). In this case, it is found that we need a new independent parameter to properly describe the dynamics of the inflaton field in general, in addition to the standard parameters conventionally denoted by ε, η, c<inf>s</inf><sup>2</sup> and s. Two illustrative examples are presented to discuss the non-slow-roll dynamics of the inflaton field consistent with observations.
Rights: © 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( Funded by SCOAP3.
DOI(Published Version): 10.1016/j.physletb.2015.06.023
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